package com.atguigu.spring5;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.Arrays;

public class JDKProxy {

    public static void main(String[] args) {
        //创建接口实现类代理对象
        Class[] interfaces = {UserDao.class};

        //匿名内部类方式
        /*Proxy.newProxyInstance(JDKProxy.class.getClassLoader(), interfaces, new InvocationHandler() {
            @Override
            public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
                return null;
            }
        });*/

        UserDao userDao = new UserDaoImpl();
        UserDao proxyInstance = (UserDao)Proxy.newProxyInstance(JDKProxy.class.getClassLoader(), interfaces, new ProxyClass(userDao));
        int result = proxyInstance.add(1, 2);
        System.out.println("result:"+result);
    }
}

//创建代理对象代码
class ProxyClass implements InvocationHandler {

    //1 把创建的是谁的代理对象，把谁传递过来
    //有参数构造传递
    private Object proxyObject;
    public ProxyClass(Object obj) {
        this.proxyObject = obj;
    }

    //增强的逻辑
    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        //方法之前
        System.out.println("方法之前执行...."+method.getName()+" :传递的参数..."+ Arrays.toString(args));

        //被增强的方法执行
        Object res = method.invoke(proxyObject, args);

        //方法之后
        System.out.println("方法之后执行...."+ proxyObject);
        return res;
    }
}
